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A uniform metal wire of resistance R is ...

A uniform metal wire of resistance R is stretched to twice its length. Now this wire is halved, and the two halves are connected in parallel. The equivalent resistance is

A

`R/2`

B

R

C

2R

D

4R

Text Solution

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The correct Answer is:
B
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CHHAYA PUBLICATION-CURRENT ELECTRICITY -EXERCISE ( MULTIPLE CHOICE QUESTION)
  1. The resistance of a wire is 5 Omega at 50^@C and 6 Omega at 100^@C . T...

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  2. If three resistances connected in series,are related as R1 gt R2 gt R3...

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  3. IF three resistances are connected in parallel and the relation betwee...

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  4. Two resistances of 6 Omega and 3 Omega are connected in parallel and t...

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  5. A series combination of three resistances 1 Omega, 2 Omega and 3 Omega...

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  6. A uniform metal wire of resistance R is stretched to twice its length....

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  7. A set of n identical resistors,each of resistance R ohm when connected...

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  8. An uniform wire of resistance 36 Omega is bent in the form of a circle...

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  9. A ring is made of a wire having a resistance R0=12 Omega. Find the poi...

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  10. When a resistance of 12 Omega is conencted with a cell of emf 1.5 V,0....

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  11. When a resistance of 12 Omega is conencted with a cell of emf 1.5 V,0....

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  12. A shunt of resistance 1 Omega is connected with a galvanometer of resi...

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  13. A galvanometer of resistance R is connected to an electric circuit. Th...

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  14. Two electric cells each of emf 1.5 V and internal resistance 2 Omega a...

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  15. n identical cells, each of emf e and internal resistance r, are first ...

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  16. Two cells each emf e but of internal resistance r1 and r2 are connecte...

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  17. A galvanometer connected with an unknown resistor and two identical ce...

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  18. In a metallic conductor, the number of free electrons per unit volume ...

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  19. When a current of 1 A flows through a copper wire of cross sectional a...

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  20. Two copper wires have a ratio of 1:4 between their diameters. IF the s...

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